diff --git a/rules.mk b/rules.mk
index 442c6fc..6c64bf9 100644
--- a/rules.mk
+++ b/rules.mk
@@ -13,9 +13,16 @@ MODULE_RUSTFLAGS += \
 	--cfg 'feature="default"' \
 	--cfg 'feature="derive"' \
 	--cfg 'feature="serde_derive"' \
+
+ifeq ($(call TOBOOL,$(TRUSTY_USERSPACE)),true)
+
+MODULE_RUSTFLAGS += \
 	--cfg 'feature="std"' \
 
+endif
+
 MODULE_LIBRARY_DEPS := \
+	trusty/user/base/lib/liballoc-rust \
 	external/rust/crates/serde_derive \
 
 include make/library.mk